Environmentalists, liability freaks and other treehuggers will fry you in wetsuit after marinating first on a fireants mound for this. If the sink next to your house drains rain water fast it could be a spot for diggin it out. And yes there are quite a few vents in our rivers that look attractive. To not let other cats out of the bag Rum Island is a honey pot.
They're usually clear because the water is coming from impassable cracks at some point. All of the stuff along that section of the Santa Fe is a perfect example
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